Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d614e70f8f6da7e…

MALICIOUS

PDF

94.1 KB Created: 2021-09-16 03:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cea542ccf94e278c296f8ac6de5057a8 SHA-1: ec2589ce8cddaea67aa7d7f8b2242a3c8cb17121 SHA-256: 5d614e70f8f6da7e93584b69157b3a58eb258425759ee304e693cd256ede4e2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of a second-stage payload via the embedded JavaScript and linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=how+to+print+part+of+a+pdf PDF link annotation
    • http://friend5190.xyz/js/ckfinder/userfiles/files/jugovusugetojiroziw.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161404e74b6422---22654435840.pdfIn PDF document text
    • https://euchebnici.com/img/file/18580213841.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/losojarilexodoteta.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/nirasemifomifuramasi.pdfIn PDF document text
    • http://benjapakee.net/UserFiles/File/goveluboxamejilib.pdfIn PDF document text
    • http://ewtch.com/upload/files/rikowatonarimaxa.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/24897864874.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134f0bf807a8---27914717097.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/45474921882.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/mitigakowupodebuzu.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/52790835741.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161409d9391bc7---62933728419.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9e2a93fe---magadojujelaj.pdfIn PDF document text
    • http://effektfilm.de/files/file/64863465737.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/fuxesuniponujiwin.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/3406999066141d5c901c1a.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 18228 bytes
SHA-256: 5f1eb07161b2fadf7834d901ae1df270dd01abdb974e5b114f3a766d7d56a8c5
font_01_sfnt_off00013c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C67 10220 bytes
SHA-256: 2217ea4072a5814139b1fcc2d5c3c0fe0b7a965774800fba428551a5a5714387
font_02_sfnt_off0001536f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1536F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1